"I ended up loving my son as a man---." Yui, the mother of Yuusuke, visits his apartment once a month to check on him while he attends university in Tokyo. However, after visiting numerous times, her love for her child gradually turns into feelings for someone of the opposite sex, ultimately leading them to cross an uncrossable boundary between man and woman. "A relationship like this can't be allowed. If we don't see each other for a while, we should be able to return to being the parent and child we were before... but is that really okay---?" Yui continues to question herself, but her body's craving is more intense than she imagined, and this month too...
